Longitudinal detection of ferromagnetic resonance using x-ray transmission measurements

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3267192· OSTI ID:22051122

Boero, G; Rusponi, S ^[1]; Kavich, J; Rizzini, A Lodi ^[2]; Piamonteze, C; Nolting, F ^[3]; Tieg, C ^[4]; Thiele, J -U ^[5]; Gambardella, P ^[2]

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1. Ecole Polytechninque Federale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)
2. Centre d'Investigacio en Nanociencia i Nanotecnologia (ICN-CSIC), E-08193 Bellaterra, Barcelona (Spain)
3. Swiss Light Source (SLS), Paul Scherrer Institut, CH-5232 Villigen (Switzerland)
4. European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble (France)
5. Seagate Technology, 47010 Kato Road, Fremont, California 94538 (United States)

We describe a setup for the x-ray detection of ferromagnetic resonance in the longitudinal geometry using element-specific transmission measurements. Thin magnetic film samples are placed in a static magnetic field collinear with the propagation direction of a polarized soft x-ray beam and driven to ferromagnetic resonance by a continuous wave microwave magnetic field perpendicular to it. The transmitted photon flux is measured both as a function of the x-ray photon energy and as a function of the applied static magnetic field. We report experiments performed on a 15 nm film of doped Permalloy (Ni{sub 73}Fe{sub 18}Gd{sub 7}Co{sub 2}) at the L{sub 3}/L{sub 2}-edges of Fe, Co, and Ni. The achieved ferromagnetic resonance sensitivity is about 0.1 monolayers/{radical}(Hz). The obtained results are interpreted in the framework of a conductivity tensor based formalism. The factors limiting the sensitivity as well as different approaches for the x-ray detection of ferromagnetic resonance are discussed.

• OSTI ID: 22051122
• Journal Information: Review of Scientific Instruments, Vol. 80, Issue 12; Other Information: (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
DOPED MATERIALS
FERROMAGNETIC MATERIALS
FERROMAGNETIC RESONANCE
GADOLINIUM ALLOYS
MAGNETIC FIELDS
MICROWAVE RADIATION
PERMALLOY
SENSITIVITY
SOFT X RADIATION
THIN FILMS
X-RAY DETECTION